50 people are selected randomly from a certain town. If their mean age is 60.5 and...
50 people are selected randomly from a certain town. If their mean age is 60.5 and o=4, find a 95% confidence interval for the true mean age, u, of everyone in the town. Show all work!
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50 people are selected randomly from a certain town. If their
mean age is 60.5 and...
30 people are selected randomly from a certain town. If their mean age is 32.2 and...
30 people are selected randomly from a certain town. If their mean age is 32.2 and standard deviation is 8.5,find a 95% confidence interval for the true mean age ,u, of everyone in the town
4. The mean age of 50 randomly selected teachers in southern California was 42.5. If it...
4. The mean age of 50 randomly selected teachers in southern California was 42.5. If it is known from other studies that the standard deviation of ages of all teachers is 8.75, (a) (2 points) Find the critical value a/2 or ta/2 that properly applies in this problem for 95% confidence interval. 05 (b) (2 points) Find the 95% confidence interval for the mean age of all teachers in southern California. Page (b) (e) (2 points) Find the margin of...
of 146 adults selected randomly from one town, 25 of them smoke. Construct a 99% confidence...
of 146 adults selected randomly from one town, 25 of them
smoke. Construct a 99% confidence interval for the true percentage
of all adults in the town that smoke.
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Points: 5 5) Of 146 adults selected randomly from one town, 25 of them smoke. Construct a 99% confidence interval for the true percentage of all adults in the town that smoke....
5. (10 points) A sample of 36 people was randomly selected from among the workers in...
5. (10 points) A sample of 36 people was randomly selected from among the workers in a shoe factory. The time taken for each person to polish a finished shoe was measured. The sample mean was 4.0 minutes. Assume that 0 = 0.7 minutes. a) Check assumptions and choose an appropriate interval procedure. b) Find a 90% confidence interval for the true mean time, , to polish a shoe. Please show your work. c) Interpret the confidence interval.
In a certain management study, 15 randomly selected managers were found to spend a mean of...
In a certain management study, 15 randomly selected managers
were
found to spend a mean of 2.40 hours each day on paperwork with a
standard deviation of 1.30 hours.
Construct a 90% Confidence Interval for the mean time spent on
paperwork by all managers.
State the meaning of the interval in the context of the
problem.
Use the given data to construct a confidence interval at the
requested level:
x = 125, n = 317, confidence level 95% (Hint: Refer...
Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5...
Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5 years. Assume the population standard deviation is 1.5 years. Construct a 99% confidence interval for the JWU population mean age. State your answer. (Zc 2.57) 1. 2. Construct a 90% confidence interval for the population mean, . Assume the population has a 2 normal distribution. A random sample of 20 JWU college students has mean annual earnings of 0 $3310 with a standard deviation...
3. The mean age of sample of 100 cars from a certain manufacturer is found to...
3. The mean age of sample of 100 cars from a certain manufacturer is found to be eleven years. If the sample standard deviation of car ages is 5 years, give a 99% confidence interval for the mean age of cars from this manufacturer. 4. The sample standard deviation of the ages of a random sample of 40 television sets in a neighborhood is 3 years. Find a 95% confidence interval for the standard deviation of the entire population of...
A survey of 25 randomly selected customers found that their average age was 31.84 years with...
A survey of 25 randomly selected customers found that their average age was 31.84 years with a standard deviation of 9.84 years. What would the critical value t* be for a 95% confidence interval with 99 degrees of freedom? What would the margin of error be for a 95% confidence interval for this data (with the sample size of 25)? Construct a 95% confidence interval for the mean age of all customers for this data (with the sample size of...
an economics professor randomly selected 100 millionaires in the united states. the average age of these...
an economics professor randomly selected 100 millionaires in the united states. the average age of these millionaires was 54.8 years with a standard deviation of 7.9 years. what is the 95% confidence interval for the mean age, of all united states millionaires. A.) A confidence interval for the mean using a table value from the standard normal distribution B.) A confidence interval for the mean using a table value from the t distribution C.) A confidence interval for a proportion...
1-Prop Conf. Int. 07 or 94 adults selected randomly from one town, 67 have health insurance....
1-Prop Conf. Int. 07 or 94 adults selected randomly from one town, 67 have health insurance. Find a 90% confidence interval for the true proportion of all adults in the town who have health insurance. Use Interval Notation with decimal rounded to the thousandths, Answer
4. The mean age of 50 randomly selected teachers in southern California was 42.5. If it is known from other studies that the standard deviation of ages of all teachers is 8.75, (a) (2 points) Find the critical value a/2 or ta/2 that properly applies in this problem for 95% confidence interval. 05 (b) (2 points) Find the 95% confidence interval for the mean age of all teachers in southern California. Page (b) (e) (2 points) Find the margin of...
of 146 adults selected randomly from one town, 25 of them
smoke. Construct a 99% confidence interval for the true percentage
of all adults in the town that smoke.
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Points: 5 5) Of 146 adults selected randomly from one town, 25 of them smoke. Construct a 99% confidence interval for the true percentage of all adults in the town that smoke....
5. (10 points) A sample of 36 people was randomly selected from among the workers in a shoe factory. The time taken for each person to polish a finished shoe was measured. The sample mean was 4.0 minutes. Assume that 0 = 0.7 minutes. a) Check assumptions and choose an appropriate interval procedure. b) Find a 90% confidence interval for the true mean time, , to polish a shoe. Please show your work. c) Interpret the confidence interval.
In a certain management study, 15 randomly selected managers
were
found to spend a mean of 2.40 hours each day on paperwork with a
standard deviation of 1.30 hours.
Construct a 90% Confidence Interval for the mean time spent on
paperwork by all managers.
State the meaning of the interval in the context of the
problem.
Use the given data to construct a confidence interval at the
requested level:
x = 125, n = 317, confidence level 95% (Hint: Refer...
Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5 years. Assume the population standard deviation is 1.5 years. Construct a 99% confidence interval for the JWU population mean age. State your answer. (Zc 2.57) 1. 2. Construct a 90% confidence interval for the population mean, . Assume the population has a 2 normal distribution. A random sample of 20 JWU college students has mean annual earnings of 0 $3310 with a standard deviation...
3. The mean age of sample of 100 cars from a certain manufacturer is found to be eleven years. If the sample standard deviation of car ages is 5 years, give a 99% confidence interval for the mean age of cars from this manufacturer. 4. The sample standard deviation of the ages of a random sample of 40 television sets in a neighborhood is 3 years. Find a 95% confidence interval for the standard deviation of the entire population of...
1-Prop Conf. Int. 07 or 94 adults selected randomly from one town, 67 have health insurance. Find a 90% confidence interval for the true proportion of all adults in the town who have health insurance. Use Interval Notation with decimal rounded to the thousandths, Answer
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